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When the app is failing to connect to the system what is the message that you are receiving?
What is the IP address of the device that you are using?
What is the IP address of the main repeater?

When the app comes up it finds our system named "Home" (previously deleted from the app to try and cure this)
Then I click to connected, it try's to connect. Times out and said "system failed to connect"
I get the same result from all the Phone's and Tablets that previously connected.

With the main repeater at an IP address of 192.168.137.254 and the device your using having an IP address of 172.27.35.41 it would indicate that they are on different networks. The IP address of the main repeater needs to have the first 3 sets of number be the same as the other devices on that network. In this case that would be 172.27.35.xxx. The last set of numbers needs to be unique for each device on the network.

I would assume then that the IP of the Main repeater is wrong, as my phone and other devices are working fine off that Wifi/Airport Extreme. I wonder how it got changed? Maybe when I plugged straight into it with laptop to finish programming.

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